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Subject: SIP in higher education

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Re: [] Re: Cisco 7960 and Avaya CCS 2.1 registration problem

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  • From: Steve Blair <>
  • To:
  • Subject: Re: [] Re: Cisco 7960 and Avaya CCS 2.1 registration problem
  • Date: Thu, 27 Jan 2005 11:13:36 -0500


A bit OT but ... Is this the configuration you use with your SER proxy?
If so do your IP phone users have the ability to do extension dialing
between themselves and/or other on campus non-IP phones? If they
do how many digits are in your extensions and how did you implement
this in SER?


Dennis Baron wrote:

I did try do it as you suggest, but I confirmed this doesn't work in the newer firmware versions (P0S3-06-3-00, P003-07-3-00). "Proxy*_address" on each line is not actually the sip proxy server address, it is the domain.

Exactly. This is a typical problem of vendors using confusing names
in their configuration schemes... at least they confuse me. Here's
what we have working on a Cisco 79xx - we're running 5.1.0 (shame on

domain_name :
image_version : "P0S3-05-1-00"
FirmLoadID : "PC030301"
phone_label : "617-324-8903 "

line1_name : "6173248903"
line1_authname :
line1_password : **********
line1_shortname : "48903"
line1_displayname : "MIT SIP Lab Cisco 7940"
proxy1_address : ""

proxy_register : 1
proxy_backup : ""
proxy_emergency : ""
outbound_proxy :

So I think all the *1_* fields are associated with the SIP account
assigned to "Line 1" - ie. "proxy1_address" is really "line1_domain" -
confusing! So the SIP URI for Line 1 is made up of
- ie.
. So you'd see
something like:

From: "MIT SIP Lab Cisco 7940"

I'll guess at the last three lines above - that all SIP requests are
sent to "outbound_proxy"; with "proxy_backup" as a fallback; and
unless "proxy_emergency" is matched in the phones dial plan. You
should be able to leave these blank and let the phone use DNS to
determine where to send the requests - but I don't know if Cisco
allows that? You also should be able to enter a FQDN in these fields
and use DNS to specify the list of proxy addresses - but I don't know
if Cisco supports that either?

Hope this helps. If anybody thinks I've got this wrong speak up -
it's been a while since I've played with a Cisco phone!



Dennis Baron; Information Services & Technology
Senior Strategist for Integrated Communications
Massachusetts Institute of Technology; Room E19-738 tel:+1-617-252-1232
77 Massachusetts Avenue; Cambridge, MA 02139-4307 fax:+1-617-253-8000


ISC Network Engineering
The University of Pennsylvania
3401 Walnut Street, Suite 221A
Philadelphia, PA 19104

voice: 215-573-8396

fax: 215-898-9348

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